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Scandium bulk phase doped and lithium chromium titanium phosphate modified positive electrode material precursor and preparation method thereof

A technology of titanium chromium lithium phosphate and positive electrode materials, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of high production cost, high energy consumption, uneven shape of precursors, etc., and achieve narrow particle size distribution , the effect of uniform particle distribution

Active Publication Date: 2021-09-03
ZHUJI PAWA NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shape of the precursor obtained by this method is not uniform, and the preparation process requires high-temperature sintering, high energy consumption, and high production costs

Method used

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  • Scandium bulk phase doped and lithium chromium titanium phosphate modified positive electrode material precursor and preparation method thereof
  • Scandium bulk phase doped and lithium chromium titanium phosphate modified positive electrode material precursor and preparation method thereof
  • Scandium bulk phase doped and lithium chromium titanium phosphate modified positive electrode material precursor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, the chemical formula of scandium bulk phase doping and titanium chromium lithium phosphate modified positive electrode material precursor is Ni 0.92 co 0.04 mn 0.04 sc 0.001 (OH) 2 0.01 Li 2 CrTi(PO 4 ) 3 .

[0041] In this embodiment, the preparation method of scandium body phase doping and titanium chromium lithium phosphate modified positive electrode material precursor includes the following steps:

[0042] (1) Add 0.46L 2moL / L NiSO 4 ·6H 2 O solution, 0.02L 2moL / L CoSO 4 ·7H 2 O solution, 0.02L2moL / L MnSO 4 ·H 2 O solution and 0.0005L 2moL / L Sc(NO 3 ) 3 The solution is mixed evenly to obtain a mixed solution;

[0043] (2) Add 4L 6mol / L NH to the mixed solution obtained in step (1) 3 ·H 2 O solution and 0.34L 6mol / LNaOH solution were stirred continuously, the pH value of the reaction system was controlled to be 10.5, the concentration of ammonia water was 2mol / L, and a co-precipitation reaction was carried out for 40 hours to obtain...

Embodiment 2

[0049] In this example, the chemical formula of scandium bulk phase doping and titanium chromium lithium phosphate modified positive electrode material precursor is Ni 0.92 co 0.04 mn 0.04 sc 0.002 (OH) 2 0.02Li 2 CrTi(PO 4 ) 3 .

[0050] In this embodiment, the preparation method of scandium body phase doping and titanium chromium lithium phosphate modified positive electrode material precursor includes the following steps:

[0051] (1) Add 0.31L 3moL / L NiSO 4 ·6H 2 O solution, 0.013L 3moL / L CoSO 4 ·7H 2 O solution, 0.013L3moL / L MnSO 4 ·H 2 O solution and 0.0006L 3moL / L Sc(NO 3 ) 3 The solution is mixed evenly to obtain a mixed solution;

[0052] (2) Add 4.5L 6.5mol / L NH 3 ·H 2 O solution and 0.27L7.5mol / L NaOH solution were stirred continuously, the pH value of the reaction system was controlled to be 11.0, the concentration of ammonia water was 2.8mol / L, and a co-precipitation reaction was carried out for 40 hours to obtain a solid-liquid mixture;

[0053]...

Embodiment 3

[0058] In this example, the chemical formula of scandium bulk phase doping and titanium chromium lithium phosphate modified positive electrode material precursor is Ni 0.92 co 0.04 mn 0.04 sc 0.003 (OH) 2 0.03 Li 2 CrTi(PO 4 ) 3 .

[0059] In this embodiment, the preparation method of scandium body phase doping and titanium chromium lithium phosphate modified positive electrode material precursor includes the following steps:

[0060] (1) Add 0.31L 3moL / L NiSO 4 ·6H 2 O solution, 0.013L 3moL / L CoSO 4 ·7H 2 O solution, 0.013L3moL / L MnSO 4 ·H 2 O solution and 0.001L 3moL / L Sc(NO 3 ) 3 The solution is mixed evenly to obtain a mixed solution;

[0061] (2) Add 4L 7mol / L NH to the mixed solution obtained in step (1) 3 ·H 2 O solution and 0.286L 7mol / LNaOH solution were stirred continuously, the pH value of the reaction system was controlled to be 11.0, the concentration of ammonia water was 2.5mol / L, and a coprecipitation reaction was carried out for 40 hours to obt...

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Abstract

The invention discloses a scandium bulk phase doped and lithium chromium titanium phosphate modified positive electrode material precursor and a preparation method thereof. The chemical formula of the precursor is NixCoyMnzScm(OH)2.nLipCrqTiw(PO4)3, wherein x is greater than or equal to 0.6 and less than 1, y is greater than 0 and less than or equal to 0.2, z is greater than 0 and less than or equal to 0.2, m is greater than 0 and less than or equal to 0.005, and n is greater than 0 and less than or equal to 0.05. The preparation method comprises the following steps of: (1) uniformly mixing a NiSO4.6H2O solution, a CoSO4.7H2O solution, a MnSO4.H2O solution and an Sc(NO3) 3 solution to obtain a mixed solution; (2) adding an NH3.H2O solution and a NaOH solution into the mixed solution, and carrying out a co-precipitation reaction to obtain a solid-liquid mixture; (3) carrying out solid-liquid separation on the solid-liquid mixture, collecting a solid, and washing and drying the solid to obtain an intermediate NixCoyMnzScm(OH)2; (4) dispersing the intermediate NixCoyMnzScm(OH)2, a lithium source and a chromium source, and then adding a phosphorus source and a titanium source to obtain a mixture; and (5) coating the mixture, evaporating the solvent, and carrying out vacuum drying to obtain the product. A proper amount of scandium element is doped in the positive electrode material precursor, the surface of the positive electrode material precursor is uniformly coated with a layer of titanium chromium lithium phosphate with a proper thickness, and the preparation method is simple, less in environmental pollution and suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material precursor and a preparation method thereof, in particular to a scandium body phase doped and titanium chromium lithium phosphate modified positive electrode material precursor and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life and no memory effect. They have become a new generation of sustainable green power sources and are widely used in many fields such as notebook computers, mobile phones and electric vehicles. With the development of electric vehicles, the market has put forward higher requirements for the energy density of lithium-ion batteries. Batteries assembled from nickel-cobalt lithium manganate cathode materials have broad application prospects in the field of power batteries due to their high capacity per gram, high voltage platform, and good cycle performance. The cathode material precursor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525C01G53/00C01B25/45
CPCH01M4/62H01M4/505H01M4/525H01M10/0525C01G53/006C01B25/45C01P2004/03C01P2004/80Y02E60/10
Inventor 张宝邓鹏林可博周亚楠邓梦轩
Owner ZHUJI PAWA NEW ENERGY
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